The CV3704 (commercially the SP13C) from Mullard is a screened amplifier HF pentode. The similar SP13 has a CT8 base. The control grid is taken to the top cap for maximum isolation between input and output circuits. This valve was used in RF and IF stages of domestic radio receivers with a common heater chain and used for Universal AC/DC sets.The KB/D identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the D identifies the maker as Mullard Radio Valve Co., Mitcham.
The reverse is plain gold coloured screening paint.The classic envelope is 42 mm in diameter and, excluding the B7 base pins, is 101 mm tall.References: Data-sheet, 1040 & 1043. |
